I was in the Army at the time. To celebrate being legal drinking age (though I'd already drank and been drunk many times before) my buddies and I went to the shoppette and bought a six pack. I only drank one; the THOUGHT of finally being legal drinking age had been appealing, but actually drinking my first legal beer didn't do much at all for me.
So I gave the rest of the six pack away, and that night my buddies and I went to a bar called Moose McGillycuddy's in Honolulu (I was stationed in Hawaii at the time). I had a couple mixed drinks, but only enough for a slight buzz. If you're stationed in Hawaii, never...ever...ever get drunk in Honolulu at night. Locals hate the military, and you're almost guaranteed to get jumped (at least that's how it was when I was there in the '90s). Anyway...
As we were leaving afterward, we stopped by an ATM, where we encountered a couple off-duty Marines being yelled at by a pair of prostitutes, because the Marines had utilized their...ahem..."services," then refused to pay. The marines got physical with them, so my buddies and I ran the jar head pricks off.
The hookers then asked us if we were looking for a date, to which I replied something along the lines of, "You're really pretty but I wouldn't feel right." They took their leave, then my buddies and I withdrew some cash and took a cab back to the barracks, where we spent the rest of the night playing Mega Man 3 on NES and chowing down on pizza.
And that was my 21st birthday.